A LED lamp is a type of solid state lighting (SSL) that utilizes light-emitting diodes (LEDs) as a source of illumination rather than electrical filaments or gas. They are tiny and CHEAP. I... for one, think adding lights to any custom...make it unique and exceptional. Since the Barricade light bar thread, I've had even more interest and thought to "how can I add lights to my custom...the best and most effective way" so I did a little research. To begin with, it seems there are hundreds of retailers online that sell LED lights very cheap, and a wide variety. Second, I think practicality takes a huge part in an idea of adding lights. Where will they go? Will the TF still be posable/transformable. Will the lights accent a feature, or will they distract eyes? Where do I put the light(s)? Luckily, there are different types of LEDs you can get. Different colors/sizes/etc. It's important to make battery replacing possible. You don't want to build a custom and seal inside a leg a battery that's got a month lifespan. Go for the gold, install the largest battery possible. Make sure also, to make the light's on/off mechanism accessible. Most would prefer a button accessible to a finger. Needing a bent paper clip to turn off or on your light...will become a pain in the but. Here are a few good lights I prefer. They last a long time, and are available in colors. The battery is large, but these will last forever. Here's the same light, disassembled: The next one is SIMPLE and in it's casing is the battery. All you need is a hole to stick it in. (get your mind back to my thread) Here's another cool one. You can even create your own...from scratch. Buying LEDs intended for 120 (or more volts) and getting the correct resistor in the power line, will adapt and mod it for battery power. Personally, I've found the quickest and cheapest way to add light to your custom is to hit up a walmart, target or random toy store. Keep an eye out for cheap toys with lights in them. Chances are - the manufacturer's gonng do the above work for you. Buy that $2 clearance toy with dust on it, and smashy smashy with hammer and out of it's insides will come your next custom light.